Collapsible core for cement-molds.



J. VICKERS. COLI.APSIBLE CORE FOR CEMENT MOLDS.

APPLICATION FILED MAYVIO, I913.

Patented May 4, 1915;

III

JOSEPH VIGKERS, OF SAN DIEGO, CALIFORNIA.

COLLAPSIBLE CORE FOR CEMENT-HOLDS.

Specification of Letters Patent.

Patented May a, 1915.

Application filed May 10, 1913. Serial No. 766,856.

- To all whom it ma concern:

Be it known t at I, JosEPH violates, a citizen of the United States, residing at San Diego, in the county of San Diego, State of California, have invented certain new and useful Improvements in Collapsible Cores for Cement-Molds; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to cement molds and has special reference to a collapsible core for such molds.

One object of the invention is to provid a core of this kind which is especially adapted for forming the interior of such articles asstationary wash tubs, bath tubs and cofiins.

Another object of theinvention is to provide means for holding the said members of the core in position and at the same time looking expansion elements from accidental Withdraw.

With the above and other objects in view the invention consists in general of certain novel details of construction and combination of parts hereinafter fully described, illustrated in the accompanying drawings and specifically claimed.

In the accompanying drawings, like characters of reference indicate like parts in the several views, and Figrue 1 is a perspective view of the entire mold assembled. Fig. 2 is a perspective View of the core assembled and removed from the outer mold. Fig. 8 is a transverse section through the core. Fig. 4 is a detail perspective of one of the core sides. Fig. 5 is a detail perspective of.

the other core side. Fig. 6 is a detail perspective of the expansion elements.

In carrying out the objects of this inven tion there is provided an. external mold which consists of the side members 10 each of which is provided at each end with ribs 11 so arranged as to form channels 12 there between. The end members 13 are fitted in these channels and are secured in position by the bolts 14 and wing nuts 15 as clearly shown in Fig. 1. v

In forming the collaps ile core there is provided apair of members each having a side wall 16 from which extends the end walls 17, the walls 17 of one pair being arranged with other edges at an angle to the opposed walls 17 of the other member as indicated clearly at 18. Each of these side members is likewise provided with a bottom 19 having extending there along a rib 20 which is spaced from the respective side walls 16 so that when the parts are assembled a clamp 21 may be placed on these ribs and have its downwardly extending lugs 22 engaged between the ribs and side walls thus holding the bottoms of the side members in adjusted relation. The expansion member consists of two substantially triangular plates 23 arranged to form portions of the end walls of the core and, when assembled fitting between the opposite edges of the end walls 17. Secured to each of the plates 23 is a flange plate 24 which, when the core is assembled fits against the inside portions of the end walls 17. Extending between these plates 24 are brace bars 25 and the lower one of these brace bars is of such height from the bottom that it engages over the clamp 21 and holds the latter from accidental disengagement with the ribs 20. Extending upward from each of the side walls 16 is an arm 26 and'these arms are connected by the end members 27 of a tension device, these end members being equipped with the usual turn buckle 28. These arms 26 and tension device are so arranged that when the core is assembled the tension device will engage the upper brace bar 25 and thus prevent the expansion members 23 from lifting and permit the core to accidentally collapse. This expansion device may also be assisted in retaining its position by means of the turning buttons 29 pivoted to the top edges of the end wall 17 and over-lapping the top edges of the expansion member.

It is to be understood that the various parts of the core and outer mold are made of suitable shape to manufacture the articles desired and in the present instance the shape shown is that of the ordinary stationary wash tub. However many varieties may be made of this shape without in any way effecting the principle of the invention and I do not desire to confine myself to the exact shape shown.

In use the outer mold is assembled in the ordinary manner and the inner mold is put together by placing the side members in proper relation and dropping the clamps 21 over the ribs 20. The expansion members are then inserted between the edges of the walls 17 and the tension device engaged over the arms 26 and screwedup to hold all the parts in position. The core is then properly specified. v 7

It will be obvious that many minor changes may be made in the form and construction of this invention without depart-- ing from the material principles thereof. It

is not therefore desired to confine the invention to the exact form herein shown and described, but it is wished .to includeall such as come properly within the scope claimed.

Having thus described the invention, what is claimed as new, is v 1. In a mold, a collapsible core compris ing a pair of opposed side members, a removable clamp connecting the bottoms of said members, awedging device located be tween said members and resting on said clamp, and a tension device connecting the members and arranged to draw the tops of said side members into close contact with said wedging device, said tension device bearing on said wedging device to hold the same in assembled position.

2. Inamold, acolla s'ible core comprising a pairof opposed side members, a clamp connecting the bottoms of said side mem: bers, spaced wedges interposed between said side members, brace bars connecting said wedges, one of said bars resting on said clamp, and \a tension device to urge said side members together and bearing on one of said brace bars.

3. In a mold, a collapsible core comprising a pair'of side members'each consisting of a side wall, end walls extending from said side walls, the end walls of one member being opposed to the end walls of. the other mem-' her and having their opposed edges diverging upwardly and bottoms connected with the end and side walls ;'ribs extending'longitudinally of said bottoms and in spaced relation to'the sidewalls; wedges arranged between the opposed edges of the end walls;

brace bars connec'tingsaid-wedges; clamps with downwardly extending ends engaging over said ribs, the lower brace bar resting on said clamp; arms extending upwardly I from the side walls; and a tension device connecting said arms and resting on the upper brace bar.

In testimony whereof, I aflix my signature, in the presence of two witnesses.

JOSEPH vrc'xnns.

Witnesses:

CLYDE A. JOHNSON, EVERETT V. VICKERS. 

